G,day World!
I am a brand new list member, unfortunately with a problem:
My car is a 1985 Audi 100 CD 5-speed manual, with the 2.3 litre HX
injected engine.
Problem: Recently, the commonly-heard valve clatter on start up, usually
associated with dry hydraulic valve lifters, became loud and permanent.
Removing the valve cover revealed one lifter to be mildly seized in the
head. I am replacing all 10 lifters, but what do I do with the "seized"
position in the head, where no lifter will fit easily (for reasons
described below)? Can I gently "hone" the hole with a nylon scouring pad
until the tight lifter slips in easily?
Bigger problem: The tight lifter position is on no.3 cylinder, in the
centre of the engine, right next to an oil spray orifice. When I removed
the valve cover, I was greeted with several small bits of badly mangled
brass, which appear to be the remains of an oil spray jet presumably
dislodged from the orifice in the centre of the head, and crushed by the
camshaft. Unfortunately, the local importer's parts microfiche does not
list a head of this configuration as ever having been imported into
Australia (car was a private import). Hence, no part number, and I have
not been able to obtain a replacement jet.
Questions: 1. Can anybody identify this oil spray jet? There is only one
jet in my HX series engine (not 2, as is more common) - located in the
centre of the head. The head hole and spray jet are both approx. 11.5 mm
in diameter, the jet being a brass cylinder about 6 mm high, with a
smaller "pimple" on top. A fine hole is drilled vertically through the
centre of the device, so oil must spray upwards and mist off the
underside of the valve cover (?).
2. Please, please, where can I get a replacement spray jet?
3. How essential is this oil spray? Can I plug the oil hole in the
head to maintain engine oil pressure?
I REALLY would appreciate some learned advice here, please.
Aside: In the centre of the camshaft, opposite the oil spray position,
is an eccentric, which appears to do nothing. Can anybody enlighten me
as to its purpose?
Hoping for a reply,
Max Blyton
1985 Audi 100 CD
AUSTRALIA